Gargomaxthalus, you can't look at this as "I pay money, so I am entitled to service.". That is simply NOT the situation we are in with Toady.
He has made no promises of service in exchange for money, or even demands money. He simply designs(with his brother), codes, and debugs a game loved and enjoyed by thousands of people, and those people enjoy the game so much that they are willing to give him money as a way of saying, "Thanks for the fun, Toady. I appreciate the game you've made and would like to show it with a gift of currency.". Hell, you enjoy the game so much you're still playing despite being furious about the bugs. You simple stopped using the features that were bugged. He receives enough gifts of money that he is capable of working on Dwarf Fortress full time.
Could he do things more efficiently and smooth out bugs immediately? You bet your ass he could. He could also one day say, "This isn't fun anymore. I'm gonna stop working on Dwarf Fortress and NOT open the code up to the thousands of people that love it.". This is his game, he owns it, and he can do with it as he pleases. We're lucky he's a cool guy and not some money mongering bastard.
The size growing bug was just discovered, and even then it's only a problem for war animal/butchering programs and Dwarves using blunt weapons. Animal programs for wool and milk still function perfectly, if not better cause the animals are potentially less dangerous and yield the same amount of wool and milk. The fact that it was just now discovered shows the gran and complex nature of the game, which isn't even halfway complete yet.
So, I have 2 possible solutions for you. Stop playing Dwarf Fortress until the game is complete. all the bugs will have been worked out and you'll have your perfect game. Or, you can relax, crack open a beer, kill some goblins, pump some magma, and have !!FUN!!, bugs and all.